Aromatic chalcogen compounds and their use

Abstract

This invention relates to dibenzothiopyran compounds. This invention also relates to layers and devices including at least one of these compounds.

1. A device comprising an anode, a cathode, and an active layer interposed between the anode and cathode, and further comprising a charge transport compound that comprises at least one dibenzothiapyran group having substructure (SS-5) in a layer selected from the active layer, a charge transport layer interposed between the active layer and the cathode, and combinations thereof: 
       
         
           
           
               
               
           
         
         wherein the single non-aromatic carbon designated as C-nine has four separate atoms bonded to it. 
       
     
     
       2. A device according to  claim 1 , wherein the charge transport compound includes 2 to 10 instances of a dibenzothiapyran substructure. 
     
     
       3. A device according to  claim 1 , wherein charge transport compound comprises (Rc-X-) n Rd wherein:
 Rc is the same or different at each occurrence and comprises a dibenzothiapyran having said substructure (SS-5); 
 X is the same or different at each occurrence and is independently selected from a single bond, an alkylene group, an arylene group, a arylenealkylene group, a heteroalkylene group, a heteroarylene group, a heteroarylenealkylene group, —C(═O)O—, —OC(═O)—, —S—, and an ether group; 
 Rd is selected from the group consisting of a multivalent alkyl group, a multivalent aryl group, a multivalent heteroalkyl group, a multivalent heteroaryl group, and a multivalent heteroarylalkyl group and 
 n is an integer from 2 to 6. 
 
     
     
       4. A device according to  claim 1 , wherein the charge transport compound comprises a compound 
       
         
           
           
               
               
           
         
       
       wherein:
 at least one of Rg, Ri, Rj, Rk, RI, and Rm is selected from an alkyl group, aryl group, aralkyl group, heteroalkyl group, and a heteroarylene group. 
 
     
     
       5. A device according to  claim 4 , wherein the charge transport compound is free of substructures selected from carbazole substructures, tertiary aromatic amine substructures, triazine substructures, and metal coordination compound substructures. 
     
     
       6. A device according to  claim 4 , wherein the charge transport compound is selected from CM-14 and CM-17